Artists are freaking out out of fear that AI will replace them (it has already begun doing so) and because their copyrights are being violated, and with a general disgust at the quality of the content.
Programmers are only freaking out about copyright because they naively believe AI can never automate them out of a job, whereas everyone else (artists included) deserves what's coming to them.
It's the same concern in both cases, but different interpretations of the stakes involved.